What is CVE-2020-6638?

CVE-2020-6638 is a high-severity vulnerability in Grin, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2020-01-21.

How severe is CVE-2020-6638?

High severity. CVSS v3 base score is 7.5 out of 10.

Improper input validation in Grin

CVE-2020-6638

Grin through 2.1.1 has Insufficient Validation.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2020-01-21 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.013 (69.9th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 70th percentile — 69.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: 0.000

Affected products

Grin

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

github.com/mimblewimble/grin/compare/v2.1.1...v3.0.0 (Third Party Advisory)
github.com/mimblewimble/grin-security/blob/master/CVEs/CVE-2020-6638.md (Technical Description, Exploit, Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2020-6638?: CVE-2020-6638 is a high-severity vulnerability in Grin, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2020-01-21.
How severe is CVE-2020-6638?: High severity. CVSS v3 base score is 7.5 out of 10.